Em Balk

Influence of reported study design characteristics on intervention effect estimates from randomised controlled trials: combined analysis of meta-epidemiological studies.

Ross J. Harris, N Welton, D Moher, 2012, Health technology assessment.

The Association Between DSM-IV Nicotine Dependence and Stressful Life Events in the National Epidemiologic Survey on Alcohol and Related Conditions

A. Agrawal, M. Lynskey, Em Balk, 2009, The American journal of drug and alcohol abuse.